feat(whaleflow): add typed workflow foundation

Harvested from PR #2482 by @AdityaVG13, preserving the typed WhaleFlow config and deterministic planner direction without exposing the runtime workflow_run tool yet.

Co-authored-by: AdityaVG13 <44177453+AdityaVG13@users.noreply.github.com>

CHANGELOG.md

@@ -33,6 +33,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   grounded objectives, context, sources, critical files, constraints,
   verification, risks, and handoff notes through the transcript card, Plan
   confirmation prompt, `/relay`, fork-state, and saved-session replay.
+- Added the first `codewhale-whaleflow` foundation crate with typed workflow
+  config/IR validation and deterministic phase ordering tests. This preserves
+  the WhaleFlow direction from #2482/#2486 without exposing a runtime
+  `workflow_run` tool until cancellation, replay, and worktree semantics are
+  release-safe. Thanks @AdityaVG13 for the WhaleFlow draft and cost-tracking
+  direction.
 - Added `POST /v1/sessions` for runtime clients to save a completed thread as a
   managed session. The endpoint preserves thread title/model/mode/workspace
   metadata, maps missing threads to 404, and returns 409 instead of snapshotting

Cargo.lock

@@ -1028,6 +1028,15 @@ dependencies = [
 name = "codewhale-tui-core"
 version = "0.8.53"
 
+[[package]]
+name = "codewhale-whaleflow"
+version = "0.8.53"
+dependencies = [
+ "serde",
+ "serde_json",
+ "thiserror 2.0.18",
+]
+
 [[package]]
 name = "colorchoice"
 version = "1.0.4"

Cargo.toml

@@ -15,6 +15,7 @@ members = [
     "crates/tools",
     "crates/tui",
     "crates/tui-core",
+    "crates/whaleflow",
 ]
 default-members = ["crates/cli", "crates/app-server", "crates/tui"]
 resolver = "2"

crates/tui/CHANGELOG.md

@@ -33,6 +33,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   grounded objectives, context, sources, critical files, constraints,
   verification, risks, and handoff notes through the transcript card, Plan
   confirmation prompt, `/relay`, fork-state, and saved-session replay.
+- Added the first `codewhale-whaleflow` foundation crate with typed workflow
+  config/IR validation and deterministic phase ordering tests. This preserves
+  the WhaleFlow direction from #2482/#2486 without exposing a runtime
+  `workflow_run` tool until cancellation, replay, and worktree semantics are
+  release-safe. Thanks @AdityaVG13 for the WhaleFlow draft and cost-tracking
+  direction.
 - Added `POST /v1/sessions` for runtime clients to save a completed thread as a
   managed session. The endpoint preserves thread title/model/mode/workspace
   metadata, maps missing threads to 404, and returns 409 instead of snapshotting

crates/whaleflow/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "codewhale-whaleflow"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+repository.workspace = true
+description = "Typed WhaleFlow workflow IR and validation for CodeWhale"
+
+[dependencies]
+serde.workspace = true
+thiserror.workspace = true
+
+[dev-dependencies]
+serde_json.workspace = true

crates/whaleflow/src/lib.rs

@@ -0,0 +1,714 @@
+//! Typed WhaleFlow workflow configuration and validation.
+//!
+//! This crate deliberately stops at the Rust-owned IR boundary. Runtime tool
+//! exposure, worktree application, replay, and model execution are layered on
+//! top only after their cancellation and evidence semantics are proven.
+
+use std::collections::{BTreeMap, BTreeSet};
+use std::path::Path;
+
+use serde::{Deserialize, Serialize};
+use thiserror::Error;
+
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct WorkflowConfig {
+    pub goal: String,
+    #[serde(default = "default_max_concurrent")]
+    pub max_concurrent: u8,
+    #[serde(default)]
+    pub description: Option<String>,
+    #[serde(default)]
+    pub phases: Vec<Phase>,
+}
+
+impl WorkflowConfig {
+    pub fn validate(&self) -> Result<(), WorkflowValidationError> {
+        WorkflowPlan::from_config(self).map(|_| ())
+    }
+
+    pub fn compile(&self) -> Result<WorkflowPlan, WorkflowValidationError> {
+        WorkflowPlan::from_config(self)
+    }
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct WorkflowPlan {
+    goal: String,
+    max_concurrent: u8,
+    phases: Vec<PhasePlan>,
+}
+
+impl WorkflowPlan {
+    pub fn from_config(config: &WorkflowConfig) -> Result<Self, WorkflowValidationError> {
+        validate_non_empty("workflow goal", &config.goal)?;
+        if !(1..=20).contains(&config.max_concurrent) {
+            return Err(WorkflowValidationError::InvalidMaxConcurrent {
+                value: config.max_concurrent,
+            });
+        }
+        if config.phases.is_empty() {
+            return Err(WorkflowValidationError::EmptyWorkflow);
+        }
+
+        let mut phase_indices = BTreeMap::new();
+        let mut all_tasks = BTreeMap::new();
+        let mut task_phase = BTreeMap::new();
+
+        for (phase_index, phase) in config.phases.iter().enumerate() {
+            validate_non_empty("phase name", &phase.name)?;
+            if phase.tasks.is_empty() {
+                return Err(WorkflowValidationError::EmptyPhase {
+                    phase: phase.name.clone(),
+                });
+            }
+            if phase_indices
+                .insert(phase.name.clone(), phase_index)
+                .is_some()
+            {
+                return Err(WorkflowValidationError::DuplicatePhase {
+                    phase: phase.name.clone(),
+                });
+            }
+
+            for task in &phase.tasks {
+                validate_non_empty("task id", &task.id)?;
+                validate_non_empty("task prompt", &task.prompt)?;
+                if all_tasks.insert(task.id.clone(), task).is_some() {
+                    return Err(WorkflowValidationError::DuplicateTask {
+                        task: task.id.clone(),
+                    });
+                }
+                task_phase.insert(task.id.clone(), phase.name.clone());
+            }
+        }
+
+        for phase in &config.phases {
+            for dependency in &phase.depends_on {
+                if dependency == &phase.name || !phase_indices.contains_key(dependency) {
+                    return Err(WorkflowValidationError::InvalidPhaseDependency {
+                        phase: phase.name.clone(),
+                        dependency: dependency.clone(),
+                    });
+                }
+            }
+            validate_parallel_write_scope(phase)?;
+        }
+
+        let ordered_phase_names = ordered_phases(config, &phase_indices)?;
+        let phase_order: BTreeMap<_, _> = ordered_phase_names
+            .iter()
+            .enumerate()
+            .map(|(index, phase)| (phase.clone(), index))
+            .collect();
+
+        for phase in &config.phases {
+            for task in &phase.tasks {
+                for dependency in &task.depends_on_results {
+                    let Some(dependency_phase) = task_phase.get(dependency) else {
+                        return Err(WorkflowValidationError::InvalidTaskResultDependency {
+                            task: task.id.clone(),
+                            dependency: dependency.clone(),
+                        });
+                    };
+                    if phase_order[dependency_phase] >= phase_order[&phase.name] {
+                        return Err(WorkflowValidationError::UnavailableTaskResultDependency {
+                            task: task.id.clone(),
+                            dependency: dependency.clone(),
+                            dependency_phase: dependency_phase.clone(),
+                            task_phase: phase.name.clone(),
+                        });
+                    }
+                }
+            }
+        }
+
+        let phases = ordered_phase_names
+            .iter()
+            .map(|phase_name| {
+                let phase = &config.phases[phase_indices[phase_name]];
+                PhasePlan {
+                    name: phase.name.clone(),
+                    parallel: phase.parallel,
+                    on_failure: phase.on_failure,
+                    tasks: phase.tasks.clone(),
+                }
+            })
+            .collect();
+
+        Ok(Self {
+            goal: config.goal.clone(),
+            max_concurrent: config.max_concurrent,
+            phases,
+        })
+    }
+
+    pub fn goal(&self) -> &str {
+        &self.goal
+    }
+
+    pub fn max_concurrent(&self) -> u8 {
+        self.max_concurrent
+    }
+
+    pub fn phases(&self) -> &[PhasePlan] {
+        &self.phases
+    }
+
+    pub fn phase_names(&self) -> impl Iterator<Item = &str> {
+        self.phases.iter().map(|phase| phase.name.as_str())
+    }
+}
+
+pub type WorkflowIr = WorkflowPlan;
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct PhasePlan {
+    pub name: String,
+    pub parallel: bool,
+    pub on_failure: FailurePolicy,
+    pub tasks: Vec<Task>,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct Phase {
+    pub name: String,
+    #[serde(default)]
+    pub description: Option<String>,
+    #[serde(default)]
+    pub depends_on: Vec<String>,
+    #[serde(default)]
+    pub parallel: bool,
+    #[serde(default)]
+    pub on_failure: FailurePolicy,
+    #[serde(default)]
+    pub tasks: Vec<Task>,
+}
+
+pub type WorkflowPhase = Phase;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
+#[serde(rename_all = "snake_case")]
+pub enum FailurePolicy {
+    #[default]
+    SkipContinue,
+    Abort,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct Task {
+    pub id: String,
+    pub prompt: String,
+    #[serde(default)]
+    pub agent_type: AgentType,
+    #[serde(default)]
+    pub mode: TaskMode,
+    #[serde(default)]
+    pub isolation: IsolationMode,
+    #[serde(default)]
+    pub file_scope: Vec<String>,
+    #[serde(default)]
+    pub depends_on_results: Vec<String>,
+    #[serde(default)]
+    pub max_steps: Option<u32>,
+    #[serde(default)]
+    pub timeout_secs: Option<u64>,
+}
+
+pub type WorkflowTask = Task;
+pub type WorkflowRole = AgentType;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
+#[serde(rename_all = "snake_case")]
+pub enum AgentType {
+    #[default]
+    General,
+    Explore,
+    Plan,
+    Review,
+    Implementer,
+    Verifier,
+    ToolAgent,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
+#[serde(rename_all = "snake_case")]
+pub enum TaskMode {
+    #[default]
+    ReadOnly,
+    ReadWrite,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
+#[serde(rename_all = "snake_case")]
+pub enum IsolationMode {
+    #[default]
+    Shared,
+    Worktree,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq, Error)]
+pub enum WorkflowValidationError {
+    #[error("{field} must not be empty")]
+    EmptyField { field: &'static str },
+    #[error("workflow must contain at least one phase")]
+    EmptyWorkflow,
+    #[error("phase `{phase}` must contain at least one task")]
+    EmptyPhase { phase: String },
+    #[error("max_concurrent must be between 1 and 20, got {value}")]
+    InvalidMaxConcurrent { value: u8 },
+    #[error("duplicate workflow phase `{phase}`")]
+    DuplicatePhase { phase: String },
+    #[error("duplicate workflow task `{task}`")]
+    DuplicateTask { task: String },
+    #[error("phase `{phase}` has invalid dependency `{dependency}`")]
+    InvalidPhaseDependency { phase: String, dependency: String },
+    #[error("phase dependency cycle includes `{phase}`")]
+    PhaseDependencyCycle { phase: String },
+    #[error("task `{task}` has invalid result dependency `{dependency}`")]
+    InvalidTaskResultDependency { task: String, dependency: String },
+    #[error(
+        "task `{task}` depends on result `{dependency}` from unavailable phase `{dependency_phase}` while running in `{task_phase}`"
+    )]
+    UnavailableTaskResultDependency {
+        task: String,
+        dependency: String,
+        dependency_phase: String,
+        task_phase: String,
+    },
+    #[error("parallel read-write task `{task}` must declare a file_scope")]
+    MissingParallelWriteScope { task: String },
+    #[error("parallel read-write tasks `{left}` and `{right}` have overlapping file scopes")]
+    OverlappingParallelWriteScope { left: String, right: String },
+}
+
+fn default_max_concurrent() -> u8 {
+    4
+}
+
+fn validate_non_empty(field: &'static str, value: &str) -> Result<(), WorkflowValidationError> {
+    if value.trim().is_empty() {
+        return Err(WorkflowValidationError::EmptyField { field });
+    }
+    Ok(())
+}
+
+fn ordered_phases(
+    config: &WorkflowConfig,
+    phase_indices: &BTreeMap<String, usize>,
+) -> Result<Vec<String>, WorkflowValidationError> {
+    let mut visiting = BTreeSet::new();
+    let mut visited = BTreeSet::new();
+    let mut ordered = Vec::with_capacity(config.phases.len());
+
+    for phase in &config.phases {
+        visit_phase(
+            &phase.name,
+            config,
+            phase_indices,
+            &mut visiting,
+            &mut visited,
+            &mut ordered,
+        )?;
+    }
+
+    Ok(ordered)
+}
+
+fn visit_phase(
+    phase_name: &str,
+    config: &WorkflowConfig,
+    phase_indices: &BTreeMap<String, usize>,
+    visiting: &mut BTreeSet<String>,
+    visited: &mut BTreeSet<String>,
+    ordered: &mut Vec<String>,
+) -> Result<(), WorkflowValidationError> {
+    if visited.contains(phase_name) {
+        return Ok(());
+    }
+    if !visiting.insert(phase_name.to_string()) {
+        return Err(WorkflowValidationError::PhaseDependencyCycle {
+            phase: phase_name.to_string(),
+        });
+    }
+
+    let phase = &config.phases[phase_indices[phase_name]];
+    for dependency in &phase.depends_on {
+        visit_phase(
+            dependency,
+            config,
+            phase_indices,
+            visiting,
+            visited,
+            ordered,
+        )?;
+    }
+
+    visiting.remove(phase_name);
+    visited.insert(phase_name.to_string());
+    ordered.push(phase_name.to_string());
+    Ok(())
+}
+
+fn validate_parallel_write_scope(phase: &Phase) -> Result<(), WorkflowValidationError> {
+    if !phase.parallel {
+        return Ok(());
+    }
+
+    let write_tasks: Vec<_> = phase
+        .tasks
+        .iter()
+        .filter(|task| task.mode == TaskMode::ReadWrite)
+        .collect();
+
+    for task in &write_tasks {
+        if task.file_scope.is_empty() {
+            return Err(WorkflowValidationError::MissingParallelWriteScope {
+                task: task.id.clone(),
+            });
+        }
+    }
+
+    for (left_index, left) in write_tasks.iter().enumerate() {
+        for right in write_tasks.iter().skip(left_index + 1) {
+            if scopes_overlap(&left.file_scope, &right.file_scope) {
+                return Err(WorkflowValidationError::OverlappingParallelWriteScope {
+                    left: left.id.clone(),
+                    right: right.id.clone(),
+                });
+            }
+        }
+    }
+
+    Ok(())
+}
+
+pub fn scopes_overlap(left: &[String], right: &[String]) -> bool {
+    left.iter().any(|left_scope| {
+        right
+            .iter()
+            .any(|right_scope| scope_overlaps(left_scope, right_scope))
+    })
+}
+
+fn scope_overlaps(left: &str, right: &str) -> bool {
+    let left = normalize_scope(left);
+    let right = normalize_scope(right);
+
+    if left == right || left == "." || right == "." {
+        return true;
+    }
+
+    if left.contains('*') || right.contains('*') {
+        return glob_prefix(&left) == glob_prefix(&right);
+    }
+
+    let left_path = Path::new(&left);
+    let right_path = Path::new(&right);
+    left_path.starts_with(right_path) || right_path.starts_with(left_path)
+}
+
+fn normalize_scope(scope: &str) -> String {
+    let trimmed = scope.trim().trim_start_matches("./").trim_end_matches('/');
+    trimmed
+        .strip_suffix("/**")
+        .or_else(|| trimmed.strip_suffix("/*"))
+        .unwrap_or(trimmed)
+        .to_string()
+}
+
+fn glob_prefix(scope: &str) -> String {
+    scope
+        .split('*')
+        .next()
+        .unwrap_or(scope)
+        .trim_end_matches('/')
+        .to_string()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn task(id: &str) -> Task {
+        Task {
+            id: id.to_string(),
+            prompt: format!("run {id}"),
+            agent_type: AgentType::General,
+            mode: TaskMode::ReadOnly,
+            isolation: IsolationMode::Shared,
+            file_scope: Vec::new(),
+            depends_on_results: Vec::new(),
+            max_steps: None,
+            timeout_secs: None,
+        }
+    }
+
+    fn config(phases: Vec<Phase>) -> WorkflowConfig {
+        WorkflowConfig {
+            goal: "cache-change".to_string(),
+            max_concurrent: 4,
+            description: None,
+            phases,
+        }
+    }
+
+    fn phase(name: &str, depends_on: &[&str], tasks: Vec<Task>) -> Phase {
+        Phase {
+            name: name.to_string(),
+            description: None,
+            depends_on: depends_on.iter().map(|value| value.to_string()).collect(),
+            parallel: false,
+            on_failure: FailurePolicy::SkipContinue,
+            tasks,
+        }
+    }
+
+    #[test]
+    fn independent_phases_preserve_declaration_order() {
+        let workflow = config(vec![
+            phase("discover", &[], vec![task("scan")]),
+            phase("report", &[], vec![task("summarize")]),
+        ]);
+
+        let plan = workflow.compile().expect("workflow should compile");
+
+        assert_eq!(
+            plan.phase_names().collect::<Vec<_>>(),
+            vec!["discover", "report"]
+        );
+    }
+
+    #[test]
+    fn dependencies_override_declaration_order_deterministically() {
+        let workflow = config(vec![
+            phase("review", &["implement"], vec![task("review-results")]),
+            phase("discover", &[], vec![task("scan")]),
+            phase("implement", &["discover"], vec![task("patch")]),
+            phase("report", &["review"], vec![task("summarize")]),
+        ]);
+
+        let plan = workflow.compile().expect("workflow should compile");
+
+        assert_eq!(
+            plan.phase_names().collect::<Vec<_>>(),
+            vec!["discover", "implement", "review", "report"]
+        );
+    }
+
+    #[test]
+    fn rejects_empty_workflow() {
+        let err = config(Vec::new())
+            .validate()
+            .expect_err("empty workflow should fail");
+
+        assert_eq!(err, WorkflowValidationError::EmptyWorkflow);
+    }
+
+    #[test]
+    fn rejects_empty_phase() {
+        let err = config(vec![phase("empty", &[], Vec::new())])
+            .validate()
+            .expect_err("empty phase should fail");
+
+        assert_eq!(
+            err,
+            WorkflowValidationError::EmptyPhase {
+                phase: "empty".to_string()
+            }
+        );
+    }
+
+    #[test]
+    fn rejects_invalid_max_concurrent() {
+        let mut workflow = config(vec![phase("discover", &[], vec![task("scan")])]);
+        workflow.max_concurrent = 0;
+
+        let err = workflow
+            .validate()
+            .expect_err("zero concurrency should fail");
+
+        assert_eq!(
+            err,
+            WorkflowValidationError::InvalidMaxConcurrent { value: 0 }
+        );
+    }
+
+    #[test]
+    fn rejects_duplicate_phase_names() {
+        let err = config(vec![
+            phase("discover", &[], vec![task("scan")]),
+            phase("discover", &[], vec![task("scan-again")]),
+        ])
+        .validate()
+        .expect_err("duplicate phase should fail");
+
+        assert!(matches!(
+            err,
+            WorkflowValidationError::DuplicatePhase { .. }
+        ));
+    }
+
+    #[test]
+    fn rejects_duplicate_task_ids() {
+        let err = config(vec![
+            phase("discover", &[], vec![task("scan")]),
+            phase("report", &[], vec![task("scan")]),
+        ])
+        .validate()
+        .expect_err("duplicate task should fail");
+
+        assert!(matches!(err, WorkflowValidationError::DuplicateTask { .. }));
+    }
+
+    #[test]
+    fn rejects_unknown_phase_dependency() {
+        let err = config(vec![phase("report", &["missing"], vec![task("summarize")])])
+            .validate()
+            .expect_err("unknown dependency should fail");
+
+        assert!(matches!(
+            err,
+            WorkflowValidationError::InvalidPhaseDependency { .. }
+        ));
+    }
+
+    #[test]
+    fn rejects_phase_dependency_cycles() {
+        let workflow = config(vec![
+            phase("a", &["b"], vec![task("a-task")]),
+            phase("b", &["a"], vec![task("b-task")]),
+        ]);
+
+        let err = workflow.validate().expect_err("cycle should fail");
+
+        assert!(matches!(
+            err,
+            WorkflowValidationError::PhaseDependencyCycle { .. }
+        ));
+    }
+
+    #[test]
+    fn rejects_task_result_dependency_from_same_parallel_phase() {
+        let mut first = task("first");
+        first.depends_on_results.push("second".to_string());
+        let mut parallel = phase("parallel", &[], vec![first, task("second")]);
+        parallel.parallel = true;
+
+        let err = config(vec![parallel])
+            .validate()
+            .expect_err("same-phase result dependency should fail");
+
+        assert!(matches!(
+            err,
+            WorkflowValidationError::UnavailableTaskResultDependency { .. }
+        ));
+    }
+
+    #[test]
+    fn rejects_task_result_dependency_from_later_phase() {
+        let mut summarize = task("summarize");
+        summarize.depends_on_results.push("scan".to_string());
+        let workflow = config(vec![
+            phase("report", &[], vec![summarize]),
+            phase("discover", &[], vec![task("scan")]),
+        ]);
+
+        let err = workflow
+            .validate()
+            .expect_err("later-phase result dependency should fail");
+
+        assert!(matches!(
+            err,
+            WorkflowValidationError::UnavailableTaskResultDependency { .. }
+        ));
+    }
+
+    #[test]
+    fn allows_task_result_dependency_from_earlier_phase() {
+        let upstream = phase("discover", &[], vec![task("scan")]);
+        let mut summarize = task("summarize");
+        summarize.depends_on_results.push("scan".to_string());
+        let downstream = phase("report", &["discover"], vec![summarize]);
+
+        config(vec![upstream, downstream])
+            .validate()
+            .expect("earlier-phase result should be available");
+    }
+
+    #[test]
+    fn rejects_parallel_read_write_without_file_scope() {
+        let mut write = task("write");
+        write.mode = TaskMode::ReadWrite;
+        let mut parallel = phase("parallel", &[], vec![write]);
+        parallel.parallel = true;
+
+        let err = config(vec![parallel])
+            .validate()
+            .expect_err("write task needs a scope");
+
+        assert!(matches!(
+            err,
+            WorkflowValidationError::MissingParallelWriteScope { .. }
+        ));
+    }
+
+    #[test]
+    fn detects_overlapping_parallel_write_scopes_with_path_boundaries() {
+        let mut left = task("auth");
+        left.mode = TaskMode::ReadWrite;
+        left.file_scope = vec!["src/auth/**".to_string()];
+        let mut right = task("auth-login");
+        right.mode = TaskMode::ReadWrite;
+        right.file_scope = vec!["src/auth/login.rs".to_string()];
+        let mut parallel = phase("parallel", &[], vec![left, right]);
+        parallel.parallel = true;
+
+        let err = config(vec![parallel])
+            .validate()
+            .expect_err("nested scopes should overlap");
+
+        assert!(matches!(
+            err,
+            WorkflowValidationError::OverlappingParallelWriteScope { .. }
+        ));
+    }
+
+    #[test]
+    fn does_not_confuse_path_prefixes_for_overlapping_scopes() {
+        let mut left = task("auth");
+        left.mode = TaskMode::ReadWrite;
+        left.file_scope = vec!["src/auth/**".to_string()];
+        let mut right = task("auth-admin");
+        right.mode = TaskMode::ReadWrite;
+        right.file_scope = vec!["src/auth_admin/**".to_string()];
+        let mut parallel = phase("parallel", &[], vec![left, right]);
+        parallel.parallel = true;
+
+        config(vec![parallel])
+            .validate()
+            .expect("component boundary scopes should not overlap");
+    }
+
+    #[test]
+    fn json_roundtrip_keeps_snake_case_enum_names() {
+        let mut task = task("patch");
+        task.agent_type = AgentType::Implementer;
+        task.mode = TaskMode::ReadWrite;
+        task.isolation = IsolationMode::Worktree;
+        task.file_scope = vec!["src/auth/**".to_string()];
+        let mut parallel = phase("implement", &[], vec![task]);
+        parallel.parallel = true;
+        parallel.on_failure = FailurePolicy::Abort;
+        let workflow = config(vec![parallel]);
+
+        let json = serde_json::to_string(&workflow).expect("serialize workflow");
+
+        assert!(json.contains("\"agent_type\":\"implementer\""));
+        assert!(json.contains("\"mode\":\"read_write\""));
+        assert!(json.contains("\"isolation\":\"worktree\""));
+        assert!(json.contains("\"on_failure\":\"abort\""));
+
+        let parsed: WorkflowConfig = serde_json::from_str(&json).expect("parse workflow");
+        assert_eq!(parsed, workflow);
+    }
+}

docs/RELEASE_RUNBOOK.md

@@ -25,6 +25,7 @@ Current packaging note:
   - `codewhale-core`
   - `codewhale-app-server`
   - `codewhale-tui-core`
+  - `codewhale-whaleflow`
 
 ## Version Coordination
 
@@ -119,20 +120,22 @@ configured.
    `main` and letting `auto-tag.yml` create the tag — see the npm wrapper
    release section below for the `RELEASE_TAG_PAT` requirement).
 4. Publish crates in this order with `./scripts/release/publish-crates.sh publish`:
-   - `codewhale-secrets`
+   - `codewhale-mcp`
-   - `codewhale-config`
    - `codewhale-protocol`
+   - `codewhale-release`
+   - `codewhale-secrets`
    - `codewhale-state`
-   - `codewhale-agent`
+   - `codewhale-tui-core`
+   - `codewhale-whaleflow`
    - `codewhale-execpolicy`
    - `codewhale-hooks`
-   - `codewhale-mcp`
    - `codewhale-tools`
+   - `codewhale-config`
+   - `codewhale-agent`
+   - `codewhale-tui`
    - `codewhale-core`
    - `codewhale-app-server`
-   - `codewhale-tui-core`
    - `codewhale-cli`
-   - `codewhale-tui`
 5. Wait for each published crate version to appear on crates.io before publishing dependents.
 
 The publish helper is idempotent for reruns: already-published crate versions are skipped.

scripts/release/crates.sh

@@ -8,6 +8,7 @@ release_crates=(
   codewhale-secrets
   codewhale-state
   codewhale-tui-core
+  codewhale-whaleflow
   codewhale-execpolicy
   codewhale-hooks
   codewhale-tools